Yes, Israel and Egypt together controlled what Gaza was allowed to import and export - not as a form of collective punishment, but to ensure its own security. There's a huge difference between that and a "full blockade" (which is what Russia did to Mariupol early in the war), so precision matters.

In terms of Hamas's army being more powerful than that of many European countries, I'll respond to that below.

And the Wikipedia article you cite has been manipulated by a band of ideological editors and is not reliable, and has no value (inverse value?) as a citation.